Aggtelek Karst is a large karst area in northeastern Hungary, covering an area of 712 km². It is located on the border of Hungary and Slovakia, with the Slovak karst forming a continuation of the Aggtelek Karst. The area is known for its numerous caves, including the Baradla Cave, which is the longest cave in Hungary and one of the largest in Europe. The cave system includes underground lakes, stalactites, and stalagmites, and is a popular tourist destination.

The Aggtelek Karst is also home to a unique ecosystem, with many rare and endangered species of plants and animals. The area was designated a UNESCO World Heritage Site in 1995 in recognition of its outstanding geological and ecological value. The caves and their surroundings are protected by national parks on both the Hungarian and Slovak sides, which aim to preserve the natural and cultural heritage of the area.

The Aggtelek Karst has a rich cultural history, with evidence of human habitation dating back to the Stone Age. The caves were used for shelter and burial by early humans, and later served as hideouts for rebels during the Ottoman and Habsburg periods. The area also has a long tradition of farming and forestry, with many traditional practices and customs still in use today.